var myHeaders = new Headers();
myHeaders.append("Content-Type", "application/json");
myHeaders.append("Accept", "application/json");
myHeaders.append("Authorization", "YOURTOKEN");

var requestOptions = {
  method: 'GET',
  headers: myHeaders,
  redirect: 'follow'
};

fetch("https://api.sportmonks.com/v3/football/leagues", requestOptions)
  .then(response => response.text())
  .then(result => console.log(result))
  .catch(error => console.log('error', error));

import requests
import json

url = "https://api.sportmonks.com/v3/football/leagues"

payload = {}
headers = {
  'Content-Type': 'application/json',
  'Accept': 'application/json',
  'Authorization': 'YOURTOKEN'
}

response = requests.request("GET", url, headers=headers, data=payload)

print(response.text)

     
package main

import (
  "fmt"
  "net/http"
  "io/ioutil"
)

func main() {

  url := "https://api.sportmonks.com/v3/football/leagues"
  method := "GET"

  client := &http.Client {
  }
  req, err := http.NewRequest(method, url, nil)

  if err != nil {
    fmt.Println(err)
    return
  }
  req.Header.Add("Content-Type", "application/json")
  req.Header.Add("Accept", "application/json")
  req.Header.Add("Authorization", "YOURTOKEN")

  res, err := client.Do(req)
  if err != nil {
    fmt.Println(err)
    return
  }
  defer res.Body.Close()

  body, err := ioutil.ReadAll(res.Body)
  if err != nil {
    fmt.Println(err)
    return
  }
  fmt.Println(string(body))
}

     
Unirest.setTimeouts(0, 0);
HttpResponse response = Unirest.get("https://api.sportmonks.com/v3/football/leagues")
  .header("Content-Type", "application/json")
  .header("Accept", "application/json")
  .header("Authorization", "YOURTOKEN")
  .asString();